The Mariners entered the American League in 1977, the same year as the Toronto Blue Jays.
No they have not.
Cleveland Indians VS Seattle Mariners SEATTLE won that ALDS 3-2 New York Yankees VS Seattle Mariners NEW YORK won the AL Pennant 4-2
They have never won a World Series title.
the Seattle Mariners
* 2003 Jamie Moyer, Seattle Mariners
The Mariners have never won the world series.
The Seattle Mariners play in Seattle, Washington
The Seattle Mariners play in Seattle, Washington
No. They went to the World Series in 2008 and lost to Philadelphia Phillies. That was their only World Series appearance.
The Seattle Mariners won that year. They lost the ALCS to the Cleveland Indians.
Lou Piniella - Seattle Mariners